Community Medicine Assessment

20 learning units • 10 questions per unit • 200 explained questions

Module 05 — Screening & Diagnostic Test Interpretation

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Question 01 • Single best answer

A test detects 90 of 100 people with disease. What is sensitivity?

A. 10% B. 50% C. 90% D. 100%

Question 02 • Single best answer

A test is negative in 810 of 900 people without disease. What is specificity?

A. 81% B. 90% C. 10% D. 9%

Question 03 • Single best answer

There are 90 true positives and 90 false positives. What is positive predictive value?

A. 90% B. 50% C. 10% D. 100%

Question 04 • Single best answer

With fixed sensitivity and specificity, lower disease prevalence usually does what to positive predictive value?

A. Always raises it to 100% B. Leaves it necessarily unchanged C. Makes all tests negative D. Decreases it

Question 05 • Single best answer

Which denominator belongs to negative predictive value?

A. All people with disease B. All positive test results C. All negative test results D. Only false positives

Question 06 • Single best answer

Earlier diagnosis increases measured survival without changing the time of death. What bias is this?

A. Recall bias B. Lead-time bias C. Observer blinding D. Random allocation

Question 07 • Single best answer

Screening disproportionately finds slowly progressing disease. What is this called?

A. Allocation concealment B. Attrition prevention C. Length bias D. Incidence density

Question 08 • Single best answer

Detection of real disease that would never cause harm during life is what?

A. False-positive classification only B. Overdiagnosis C. A false negative D. Under-reporting

Question 09 • Single best answer

What is essential before introducing a screening test at scale?

A. An effective follow-up and management pathway B. A test with a fashionable name only C. Guaranteed testing of every age regardless of evidence D. Removal of informed choice

Question 10 • Single best answer

At sensitivity 0.90 and specificity 0.90, what is the positive likelihood ratio?

A. 0.9 B. 1 C. 9 D. 0.1

0 / 10 answered